Improvement in steam-pumps



J. R.N|AXWELL &IEZRA COPE.

Steam Pumps.

No.7]23185! -Patentedlan.30,1872.

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JAMES e. MAXWELL, or CINCINNATI, omo, AND EZRA corn, on COVING- rroN, KENTUCKY.

EMPROVEMENT IN STEAWFPUWIPS.

Specification forming part of Letters Patent No. 123,185, dated January 30, 1872.

To all whom it may concern:

Be it known that we, JAMEs P. MAXWELL, of Cincinnati, in the countyot'Hamilton and State of Ohio, and EzuA CCPE, of Covington, in the county of Kenton and State of Kentucky, have invented anew and useful Improvement in Direct- Acting Steam Pumps; and do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawing and to 4the letters of reference marked thereon, like figures referring to like parts.

The invention consists in the method of constructing and operating the steam and pump valves, and the manner of arranging and combining the respective parts of the machine.

To enable others skilled in the art to make and use our invention, we now proceed to fully describe the construction and operation of the same.

A represents a steam-cylinder, with the ordinary steam-passagesleading from their respective ports from the valve-seatin the steam-chest to each end of the steam-cylinder, as shown by the dotted lines Z1 b b and b b b', Figure 1. The steam-chest D, main exhaust-chamber a, and the chamber in which the rocker-arm H plays, are cast in one piece with the steam-cylinder and closed with caps M, W, X, and X, fitted and bolted thereon. The separation of the exhaust-chamber from the chamber of the rocker-arm and the prevention of communica tion between the ends ofthe steam-cyliud er are effected by jointed surfaces and the enlarged or plug-like aXis of the rocker-arm iitted in bearings, as shown in Fig. 2. G, Figs. 3 and 9, represents a-n auxiliary val Ve properly chambered for end play in the main exhaust-chamber to be actuated by a finger extending from the axis of the rocker-arm, and is designed to open and close communication between the ends of the steam-chest or auxiliary cylinder D D and the main exhaust-chamber when in its movement the passages c and c leading from either end ofthe auxiliary cylinder are cov-V eredoruncovered byit. H, in Figs. 5, 6,and8, represents a rocker-arm, pivoted on an axis and with inclined faces on bent ends, so adjusted in' length as to reach into the interior of the steam-cylinder at or near each end, and derive amotion, from contact with the piston-head,

of the steam-cylimler.

in a plane at right angles to an axial section In Fig. 3 E represents an auxiliarypiston recessed to receivethe usual D-form ot' valve F, and allow it slight space` for end motion, and having return steam-passages f f and f j" f leading from either end of the recess to terminate, respectively, at the opposite ends ot' the auxiliary piston, for the purpose of delivering steam from the auxiliary cylinder-where the steam is admitted in the usual mannerto impel the auxiliary piston and valve in alternate directions, as communication of the passages with the interior of the auxiliary cylinder may be made by the position of the co-operating parts. B, in Figs. 4 and l0, represents a pump-cylinder, with the usual passages, chambers, and openings, connected in line with the stema-cylinder by a distance piece of usual form. The valve-chamber of the pumps is provided with dislevalves P P P P, as shown in Figs. 12, 11, l and 4, so formed as to be guided on central stems when clustered to operate on a number pf planes, which afford a group of planes for valveseats formed in a single casting for the advantages of economy, compactness, directness, and increase of water-way. The valves are formed with a raised ledge or guard on the verge of the top or back to serve as a sea-t for a spiral or volute sprino'. The base ofthe spring' is made by soldering the iirst coil in the form ot a ring, from which the volute form is generated. In' Figs. l and 4 V represents a lever, pivoted to the piston-rod and the swinging link, for the purpose of operating the machine by manual power when used as a test-pump for boilers, or at other times in the absence of steam. Additional rods, properly connected to the lever, may be made to at't'ord another mode of imparting the required mot-ion to the auxiliary valve.

To operate the machine steam is admitted into the auxiliary cylinder, a movement of the auxiliary valve is effected to open communication between the auxiliary cylinder and the exu haust-chamber through the passage c, and thus exhaust all pressure from the relating end ot' the. auxiliary piston, which piston freely moves and brings one end of the recess in contact with the D-\'alve, which slight movement completely closes the passa ge f j' f and opens space at the opposite end of the recess to admit steam to the passage f ff and deliver the steam at the end ofthe auxiliary piston, where that passage terminates. The auxiliary pis ton with the D-valve is impelled, after cout-act, in the same direction. The D-Valve per mitsfree How of 'steam in the direction of the arrow showmthrough the passage b b b', into the steameylinder, to move the main piston until the auxiliary piston passes over the port t0 the passage c and is arrested for the reverse movement bynthe steam trapped in the end of the auxiliary cylinder, effected b v the main piston having completed its stroke and imparted, through contact with the rocker-arm, motion to the auxiliary valve, to close the passage c and exhaust from the other end of the auxiliary piston to permit the reverse and alternate recil'nocatiug motion throughout the relating parts and entire machinery.

. Having thus fully described the construction and operation of our invention, what We. desire. to secure by Letters Patent is- 1. The auxiliary piston, formed with a recess to receive aV D-valve, and provided with high steam-passages fff and fff, leading,1 from each end of the recess to the opposite end of the auxiliary piston, when the auxiliary piston and the D-valve are arranged to co-operatein order to open and close the passages f j' f and f f j" substantially as shown anddescribed.

2. The arrangement of the auxiliary valve Within the main exhaust-chamber, in combina-- tion with ay direct-acting steam-pump, substantially as shown and described.

3. The rock-shaft H, with its axis at right angles to that of the main cylinder, formed in one piece, with inclined faces or ends to project into the main cylinder near its ends, substantially as shown and described.

4. A disk-valve, havin ga raised ledge orrim, for the purpose. described, when constructed so as to be guided in the operation of opening and closing by central stems7 substantially as shown and described.

5. A cluster of valve-seats, each seat being formed on a different facet or part of a surface, having,` eonvexity, for the purpose described, in combination with disk-Valves guided in the operation of opening` and closing; by central stems, when constructed and arranged substantially as shown and described.

JAMES R. MAXWELL. EZRA COPE.

Witnesses N. MARCHAND, Y Trios. S. Roys-n. 

